Create Alias in Office 365

Hello Experts,
I have few requirements:
1. I have Primary emails created in O365: user@abc.com
2. I want to export the list of all users in O365 with their Email addresses.
3. I want to create Alias's for all the user, which will be more than 1 e.g. user.name@abc.com & user@xyz.com & user.name@xyz.com
In the above step there is a different Domain name also, i have the accepted domain already staged.
4. Also, I want to delete the .onmicrosoft.com for all users (if possible)

I would prefer if I can export the existing users in csv, then update different columns with Alias's & then update via powershell calling updated csv.

If you remove the actual user, the above example can also be run against the full list (or a subset) of users, and will add the firstname.lastname@domain.com alias for all of them. Which for me is way better method than doing it manually via CSV.

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Thanks Vasil,
Let me try to explain again....
As for the first & last name it's fine, but we have some special internal names (as illustrated in earlier example "jj@abc.com & jj@xyz.com"
Because of this the above listed script won't suffice the need.

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